JP2653202B2 - High frequency heating equipment - Google Patents
High frequency heating equipmentInfo
- Publication number
- JP2653202B2 JP2653202B2 JP2017325A JP1732590A JP2653202B2 JP 2653202 B2 JP2653202 B2 JP 2653202B2 JP 2017325 A JP2017325 A JP 2017325A JP 1732590 A JP1732590 A JP 1732590A JP 2653202 B2 JP2653202 B2 JP 2653202B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- frequency output
- output
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000010438 heat treatment Methods 0.000 title description 14
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
Landscapes
- Control Of High-Frequency Heating Circuits (AREA)
- Protection Of Static Devices (AREA)
- Inverter Devices (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、電子レンジ等のマグネトロンを具備した高
周波加熱装置に関し、特にはインバータ回路を用いるマ
グネトロン電力供給装置とシステム制御回路とのインタ
フェースの方式に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device having a magnetron such as a microwave oven, and more particularly to an interface between a magnetron power supply device using an inverter circuit and a system control circuit. It is.
従来の技術 近年、商用電源を整流して一旦直流に変換し、高周波
スイッチングで高周波に変換した後、トランスで昇圧す
るインバータ電源が高周波加熱装置に用いられつつあ
り、更にはその高周波出力を可変するように構成した高
周波加熱装置も提供されている。2. Description of the Related Art In recent years, an inverter power supply, which rectifies a commercial power supply and temporarily converts it to direct current, converts it to high frequency by high-frequency switching, and then boosts the voltage with a transformer, is being used in a high-frequency heating device, and further varies its high-frequency output. A high-frequency heating device configured as described above is also provided.
発明が解決しようとする課題 このように高周波出力を可変するように構成した高周
波加熱装置に於て、装置全体の制御を司るシステム制御
回路とインバータ電源とのインタフェースの方式が複雑
であった。Problems to be Solved by the Invention In such a high-frequency heating device configured to vary the high-frequency output, an interface system between a system control circuit that controls the entire device and an inverter power supply is complicated.
本願はこれらを簡単な構成とし、かつ異常時に於ても
安全モードとなる構成の高周波加熱装置を提供すること
を目的とする。An object of the present application is to provide a high-frequency heating device having a simple configuration and a configuration in which a safety mode is set even in the case of an abnormality.
課題を解決するための手段 そこで上記目的を達成するために本発明は、単方向電
源と、高圧トランスと、前記単方向電源の電力を高周波
スイッチング動作で高周波電力に変換して前記高圧トラ
ンスの一次側に供給するスイッチング素子より成るイン
バータ回路部と、前記高圧トランスの二次側に発生する
高圧電力を供給されて高周波発振するマグネトロンと、
前記高周波スイッチング動作に同期し、かつ高周波出力
が、基準信号入力に対応するべく変化するPWM（パルス
幅変調）信号を出力して前記スイッチグ素子の高速スイ
ッチング動作を制御する電力制御部と、前記PWM信号の
出力ON/OFFを制御し、かつ停止信号入力により、PWM信
号出力をOFFに制御する保護回路部と、システム全体の
制御を司り、かつ前記高周波出力値を周波数で表わした
高周波出力設定信号と、前記高周波出力のON/OFFを指示
する高周波出力ON/OFF信号とを出力するシステム制御回
路部と、 前記高周波出力設定信号を第１の絶縁結合回路を介
し、更にＦ−Ｖ変換回路で電圧に変換した前記電力制御
部への基準信号と、前記高周波出力ON/OFF信号を第２の
絶縁結合回路を介した前記保護回路への停止信号とを出
力するインタフェース回路部とを高周波加熱装置に具備
したものである。Means for Solving the Problems In order to achieve the above object, the present invention provides a unidirectional power supply, a high-voltage transformer, and converting the power of the unidirectional power supply to high-frequency power by a high-frequency switching operation, and An inverter circuit portion including a switching element that supplies a high-voltage power generated on the secondary side of the high-voltage transformer, and a magnetron that performs high-frequency oscillation.
A power control unit that controls a high-speed switching operation of the switching element by outputting a PWM (pulse width modulation) signal synchronized with the high-frequency switching operation and whose high-frequency output changes to correspond to a reference signal input; A protection circuit for controlling the output ON / OFF of the signal, and controlling the output of the PWM signal to OFF by inputting a stop signal; and a high-frequency output setting signal for controlling the entire system and expressing the high-frequency output value in frequency. A high-frequency output ON / OFF signal for instructing ON / OFF of the high-frequency output, and a system control circuit unit that outputs the high-frequency output setting signal via a first insulating coupling circuit, and further with an FV conversion circuit. A reference signal to the power control unit that has been converted into a voltage, and an interface circuit unit that outputs a stop signal to the protection circuit via a second insulating coupling circuit for the high-frequency output ON / OFF signal. Is provided in the high-frequency heating device.
作用 このように本発明による高周波加熱装置では、高周波
出力値を周波数で表わし、かつ電力制御回路部へは絶縁
結合回路を介してこの周波数を電圧に変換して入力する
ように構成しているので、操作スイッチ等を接続してい
るシステム制御回路と、商用電源に間接的に接続される
電力制御回路部との間を絶縁を確保しつつ、かつＦ−Ｖ
変換回路という簡単な構成で信号の受け渡しを安全に、
また確実に行なう高周波加熱装置を提供できる。As described above, the high-frequency heating device according to the present invention is configured such that the high-frequency output value is represented by a frequency, and the frequency is converted into a voltage and input to the power control circuit via an insulating coupling circuit. While ensuring insulation between the system control circuit connecting the operation switches and the like and the power control circuit unit indirectly connected to the commercial power supply,
With a simple configuration called a conversion circuit, the transfer of signals is safe,
Further, it is possible to provide a high-frequency heating device that performs the operation reliably.
更には、高周波出力をOFFにする場合に、前記周波数
を０（直流）に設定して高周波出力をOFFに制御する
系統と高周波出力ON/OFF信号をOFF側に設定して高周波
出力をOFFに制御する系統との２系統で出力をOFFにして
いるので一方の系統がダウンしても確実に出力のOFFが
成される安全な高周波加熱装置が提供できる。Further, when the high-frequency output is turned off, the frequency is set to 0 (DC) to control the high-frequency output to be OFF, and the high-frequency output ON / OFF signal is set to the OFF side to turn off the high-frequency output. Since the output is turned off in two systems, the system to be controlled and the system to be controlled, it is possible to provide a safe high-frequency heating device in which the output is reliably turned off even if one of the systems goes down.
実施例 第１図は本発明の、第１の実施例による高周波加熱装
置の回路構成図である。FIG. 1 is a circuit diagram of a high-frequency heating device according to a first embodiment of the present invention.
商用電源１をブリッジ整流器２で整流して得られる単
方向電源３をスイッチング素子４の高周波スイッチング
動作で高周波電源に変換して高圧トランス５の一次側に
電力供給し、二次側出力を高圧コンデンサ６と高圧ダイ
オード７とで倍電圧整流した高圧電力をマグネトロン８
に印加して電力を供給するように構成している。The unidirectional power supply 3 obtained by rectifying the commercial power supply 1 by the bridge rectifier 2 is converted into a high-frequency power supply by the high-frequency switching operation of the switching element 4 to supply power to the primary side of the high-voltage transformer 5, and the secondary-side output to a high-voltage capacitor The high voltage power rectified by the double voltage with the high voltage diode 6 and the high voltage diode
To supply electric power.
高圧トランス５の二次側に接続された二次側電流検出
素子（以下カレントトランスと記す）９の出力を整流・
平滑回路10で直流に変換した検出出力値11は誤差増幅回
路12で基準信号13と比較される。この誤差増幅回路12の
出力と、スイッチング素子４の高周波スイッチング動作
と同期して発振する同期発振回路14よりの、のこ切り波
15とにより、PWM回路16はスイッチング素子４へPWM（パ
ルス幅変調）信号17を出力する。The output of a secondary side current detecting element (hereinafter referred to as a current transformer) 9 connected to the secondary side of the high voltage transformer 5 is rectified.
The detected output value 11 converted to DC by the smoothing circuit 10 is compared with the reference signal 13 by the error amplifier circuit 12. A sawtooth wave from a synchronous oscillation circuit 14 that oscillates in synchronization with the output of the error amplifier circuit 12 and the high-frequency switching operation of the switching element 4.
As a result, the PWM circuit 16 outputs a PWM (pulse width modulation) signal 17 to the switching element 4.
このように構成することにより、高圧トランス５の二
次側電流の検出出力値11が増加すると、PWM信号17のON
時間が短くなって二次側電流が減少し、逆に検出出力値
11が低下するとON時間が長くなって二次側電流が増加す
るので、検出出力値11側の比較信号19が第１の基準信号
13と一致するように制御され、高圧トランス５の二次側
電流は常に一定に保たれる。With this configuration, when the detection output value 11 of the secondary current of the high-voltage transformer 5 increases, the PWM signal 17 is turned on.
The time becomes shorter, the secondary current decreases, and conversely, the detection output value
When 11 decreases, the ON time becomes longer and the secondary current increases, so the comparison signal 19 on the detection output value 11 side becomes the first reference signal.
13, the secondary side current of the high voltage transformer 5 is always kept constant.
従ってマグネトロン８よりの高周波出力は基準信号13
に応じた値に安定化されることになる。Therefore, the high frequency output from the magnetron 8 is equal to the reference signal 13
Will be stabilized.
この電力制御部18への基準信号は、装置全体の制御を
司るシステム制御回路部19よりの、高周波出力値を第２
図のように周波数で表わした高周波出力設定信号20を、
インタフェース回路部21のＦ−Ｖ変換回路22で第３図に
示されるように電圧に変換して入力される。The reference signal to the power control unit 18 is obtained by converting the high-frequency output value from the system control circuit unit 19 that controls the entire apparatus into a second signal.
The high-frequency output setting signal 20 represented by the frequency as shown in FIG.
As shown in FIG. 3, the signal is converted into a voltage by the FV conversion circuit 22 of the interface circuit section 21 and input.
従って、電力制御回路部18は高周波出力を基準信号13
の大きさに応じた値に制御するので、第２図に示される
ような関係で高周波出力を高周波出力設定信号20の周波
数で示される値に制御する構成となる。Therefore, the power control circuit unit 18 outputs the high frequency output to the reference signal 13
, The high-frequency output is controlled to a value indicated by the frequency of the high-frequency output setting signal 20 in a relationship as shown in FIG.
また、回路の電源の立上り時や異常等を検知してPWM
信号17の出力を禁止する保護回路部23は、外部よりの停
止信号24によってもPWM信号17の出力を禁止するように
構成されている。システム制御回路部19からは前記した
高周波出力設定信号20とは別に高周波出力ON/OFF信号25
が出力されインタフェース回路部21で前記した停止信号
24に変換される。Also, when the power supply of the circuit rises or abnormalities are detected, the PWM
The protection circuit unit 23 that prohibits the output of the signal 17 is configured to prohibit the output of the PWM signal 17 even by an external stop signal 24. The high frequency output ON / OFF signal 25 separately from the high frequency output setting signal 20 from the system control circuit unit 19
Is output and the stop signal described above in the interface circuit unit 21 is output.
Converted to 24.
このインタフェース回路部21は第１図に示されるよう
に、高周波出力設定信号20には第１の絶縁結合回路とし
て第１のフォトカップラ26を、及び高周波出力ON/OFF信
号25には第２の絶縁結合回路として第２のフォトカップ
ラ27を介して絶縁を確保しつつ信号の受け渡しを行なっ
ている。As shown in FIG. 1, the interface circuit section 21 includes a first photocoupler 26 as a first insulating coupling circuit for the high frequency output setting signal 20 and a second photocoupler 26 for the high frequency output ON / OFF signal 25. Signals are transferred while ensuring insulation via a second photocoupler 27 as an insulating coupling circuit.
第４図は、システム制御回路部19よりの高周波出力設
定信号20と高周波出力ON/OFF信号25との出力と高周波出
力の一例であるが、図のように高周波出力を０（OFF）
にする時には高周波出力ON/OFF信号25をOFFに設定する
と同時に高周波出力設定信号20の周波数も０（直流）に
設定して高周波出力を２系統からOFFにするように制御
する構成にして、例え一系統が壊れた場合にも確実にOF
Fできる構成にしている。FIG. 4 shows an example of the output of the high-frequency output setting signal 20 and the high-frequency output ON / OFF signal 25 from the system control circuit section 19 and the high-frequency output.
For example, when the high frequency output ON / OFF signal 25 is set to OFF, the frequency of the high frequency output setting signal 20 is also set to 0 (DC) and the high frequency output is controlled to be turned off from two systems. Reliably OF even if one system is broken
It has a configuration that allows F.
ここで、第１の実施例ではインタフェース回路部21の
絶縁結合回路にフォトカップラを使用しているが、パル
ストランス等を用いる他の実施例も考えられる。但し、
パルストランスは直流信号を伝送することができないの
で、その場合には、高周波出力ON/OFF信号25の形態を例
えばONを交流、OFFを直流のように変更して更にインタ
フェース回路部21に於て交流／直流弁別回路を追加して
停止信号24に変換する等の処置が必要となる。Here, in the first embodiment, a photocoupler is used for the insulating coupling circuit of the interface circuit section 21, but another embodiment using a pulse transformer or the like is also conceivable. However,
Since the pulse transformer cannot transmit a DC signal, in that case, the form of the high-frequency output ON / OFF signal 25 is changed to, for example, ON for AC and OFF for DC, and further in the interface circuit section 21. It is necessary to take measures such as adding an AC / DC discriminating circuit and converting it into a stop signal 24.
発明の効果 以上のように本発明による高周波加熱装置では高周波
出力値を電位の違う回路間で絶縁を確保しつつ、かつ簡
単な構成でシステム制御回路より制御でき、更には２重
の系統で確実に高周波出力をOFFできる安全な高周波加
熱装置が提供できる。As described above, in the high-frequency heating device according to the present invention, the high-frequency output value can be controlled by the system control circuit with a simple configuration while ensuring insulation between circuits having different potentials. A safe high-frequency heating device capable of turning off the high-frequency output can be provided.
第１図は本発明の第１の実施例による高周波加熱装置の
回路構成図、第２図は高周波出力設定信号と高周波出力
との関係を示す図、第３図はＦ−Ｖ変換回路の入力と出
力との関係を示す図、第４図はシステム制御回路よりの
出力例とその時の高周波出力との関係を示す図である。 ３……単方向電源、４……スイッチング素子、５……高
圧トランス、８……マグネトロン、13……基準信号、17
……PWM信号、18……電力制御回路部、19……システム
制御回路部、20……高周波出力設定信号、21……インタ
フェース回路部、22……Ｆ−Ｖ変換回路、23……保護回
路部、24……停止信号、25……高周波出力ON/OFF信号、
26……第１のフォトカップラ、27……第２のフォトカッ
プラ。FIG. 1 is a circuit diagram of a high-frequency heating device according to a first embodiment of the present invention, FIG. 2 is a diagram showing a relationship between a high-frequency output setting signal and a high-frequency output, and FIG. FIG. 4 is a diagram showing a relationship between an output example from the system control circuit and a high-frequency output at that time. 3 ... unidirectional power supply, 4 ... switching element, 5 ... high voltage transformer, 8 ... magnetron, 13 ... reference signal, 17
... PWM signal, 18 ... Power control circuit section, 19 ... System control circuit section, 20 ... High frequency output setting signal, 21 ... Interface circuit section, 22 ... FV conversion circuit, 23 ... Protection circuit , 24 ... Stop signal, 25 ... High frequency output ON / OFF signal,
26 ... first photocoupler, 27 ... second photocoupler.
Claims (1)
向電源の電力を高周波スイッチング動作で高周波電力に
変換して前記高圧トランスの一次側に供給するスイッチ
ング素子より成るインバータ回路部と、前記高圧トラン
スの二次側に発生する高圧電力を供給されて高周波発振
するマグネトロンと、前記高周波スイッチング動作に同
期し、かつ高周波出力が、基準信号入力に対応するべく
変化するPWM（パルス幅変調）信号を出力して前記スイ
ッチング素子の高速スイッチング動作を制御する電力制
御部と、 前記PWM信号の出力ON/OFFを制御し、かつ停止信号入力
により、PWM信号出力をOFFに制御する保護回路部と、 システム全体の制御をつかさどり、かつ前記高周波出力
値を周波数で表わした高周波出力設定信号と、前記高周
波出力のON/OFFを指示する高周波出力ON/OFF信号とを出
力するシステム制御回路部と、 前記高周波出力設定信号を第１の絶縁結合回路を介し、
更にＦ−Ｖ（周波数−電圧）変換回路で電圧に変換した
前記電力制御部への基準信号と、前記高周波出力ON/OFF
信号を第２の絶縁結合回路を介した前記保護回路への停
止信号とを出力するインタフェース回路部とを具備して
成る高周波加熱装置。An inverter circuit unit comprising: a unidirectional power supply; a high-voltage transformer; a switching element that converts power of the unidirectional power supply to high-frequency power by a high-frequency switching operation and supplies the high-frequency power to a primary side of the high-voltage transformer; A magnetron that is supplied with high-voltage power generated on the secondary side of a high-voltage transformer and oscillates at a high frequency, and a PWM (pulse width modulation) signal synchronized with the high-frequency switching operation and whose high-frequency output changes to correspond to a reference signal input A power control unit that controls the high-speed switching operation of the switching element by outputting a signal, a protection circuit unit that controls the output ON / OFF of the PWM signal, and controls the output of the PWM signal to OFF by inputting a stop signal, A high-frequency output setting signal that controls the entire system and indicates the high-frequency output value in frequency, and specifies ON / OFF of the high-frequency output. A system control circuit unit for outputting a high-frequency output ON / OFF signals that, via a first insulating coupling circuit the high-frequency output setting signal,
Further, a reference signal to the power control unit converted into a voltage by an FV (frequency-voltage) conversion circuit and the high-frequency output ON / OFF
An interface circuit for outputting a signal to the protection circuit via a second insulating coupling circuit and a stop signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017325A JP2653202B2 (en) | 1990-01-26 | 1990-01-26 | High frequency heating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017325A JP2653202B2 (en) | 1990-01-26 | 1990-01-26 | High frequency heating equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03222281A JPH03222281A (en) | 1991-10-01 |
| JP2653202B2 true JP2653202B2 (en) | 1997-09-17 |
Family
ID=11940891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2017325A Expired - Fee Related JP2653202B2 (en) | 1990-01-26 | 1990-01-26 | High frequency heating equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2653202B2 (en) |
-
1990
- 1990-01-26 JP JP2017325A patent/JP2653202B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03222281A (en) | 1991-10-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |